Add a custom elbow (cut elbow other than the Default 90 degree that is most applicable to butt welded pipe cases.) Route pipe in the 3D sketcher in reference to (directionally) other surfaces of the assembly. Getting away from the standard (3 tab key) axis’s that gets its orientation from the origin of the assembly. Change a Long radius elbow (the Default) to a Short radius. Add a standard 45 degree (long radius) elbow the route assembly. Add a reducing elbow. Add an eccentric reducer. Butt custom elbows together.